What should a driver do in the event of a breakdown or incident in a tunnel?

Beckon other traffic to overtake.
Reverse the vehicle if necessary to make room for overtaking traffic.
Switch off the engine and switch on the hazard lights.
Signal the vehicle behind to stop and ask the driver to summon help at the other end of the tunnel.

Explantion: If your vehicle breaks down or is involved in a collision in a tunnel, switch on your hazard warning lights, switch off your engine, go to an emergency station and use the emergency phone to alert the tunnel operator.

Theory Tester

What should a driver do in the event of a breakdown or incident in a tunnel?

Managing Risk